The 9mm BCG is manufactured with one thing in mind and that is compatibility. This 9mm bolt carrier is manufactured out of 8620 steel and features a Nitride finish for corrosion and wear resistance. We understand the stress these BCG’s can be put through by an avid shooter and understand malfunctions on the battlefield are NOT acceptable. The ramped design allows use with standard hammers and are also compatible with Glock™ 9mm or Colt™ 9mm magazines!